Kaushitaki Upanishad 4.4

4.4.1

sa hovāca bālākir ya evaiṣa candramasi puruṣas tam evāham upāsa iti /

4. Then said Bālāki: ‘Him who is this person in the moon—him indeed I reverence.’

4.4.2

taṃ hovācājātaśatrur mā maitasmin saṃvādayiṣṭhāḥ /

To him then Ajātaśatru said: ‘Make me not to converse on him! As King Soma, as the soul (ātman) of Food—thus, verily, I reverence him.’

4.4.3

bṛhan pāṇḍaravāsāḥ somo rājānnasyātmeti vā aham etam upāsa iti /

4.4.4

sa yo haitam evam upāste'nnasyātmā bhavati //4//

He then who reverences him thus, becomes the soul of food.